Whats 1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9

90

Step-by-step explanation:

90 is your answer

Step-by-step explanation:

first I just added all similar numbers together, then I added the answers of all the similar numbers together one-by-one, finally we find our answer, 90

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.

30 feet

step-by-step explanation:

that would be 2 1/2 * 12

= 24 + 6

= 30 feet   (answer)